Se p 20 02 A non - QE signature of ν e appearance in a water Cherenkov detector
نویسندگان
چکیده
We argue that analyzing the ν e-induced CC reaction ν e n → e − π 0 p along with the quasielastic reaction ν e n → e − p may significantly enhance the sensitivity of a water Cherenkov detector to the subleading oscillation ν µ → ν e at neutrino energies ∼ 2–3 GeV, as projected for the off-axis neutrino beam of NuMI. At the level of standard selections, the multi-ring signal of ν µ → ν e yielded by this π 0-producing reaction is comparable to the 1-ring (quasielas-tic) signal in statistical significance. The neutral-current background to ν e n → e − π 0 p can be further suppressed by analyzing spatial separation between the reconstructed primary vertex and the vertices of individual rings. Detecting the " subleading " oscillation ν µ → ν e in an off-axis beam with peak energy near 2–3 GeV has emerged as one of the major goals of the NuMI program [1], addressed at a Fermilab workshop in May 2002 [2] and in a recent Letter of Intent on the subject [3]. A 2.5–3 times bigger baseline than in the proposed JHF2K experiment [4], that will operate at a lower beam energy of E ν ∼ 0.7–0.8 GeV, will allow to probe the matter effect by comparing the probabilities of the 1
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